Balance Sheet Components - Other Assets (Detail) (USD $)	Sep. 26, 2014	Sep. 27, 2013
Other assets:
DCP assets	$ 59,600,000	$ 55,200,000
Investments in privately-held companies	64,700,000	71,100,000
Long-term receivables	58,500,000	26,000,000
Intangible assets	40,900,000	23,400,000
Long-term deferred tax assets	11,500,000	10,500,000
Other	49,300,000	36,800,000
Total other assets	$ 284,500,000	$ 223,025,000